Improvement in car-brakes



E. sgvmz.

CAR-BRAKE.

N o.188,313. Patented March 13,1877.' I

".FETERS, FHOTO-LITHDGRAPHER, WASHINGTON. D4 6 FFIGE.

PATENT EDWIN SQUIRE, OF CLEVELAND, OHIO.

IMPROVEMENT IN CAR-BRAKES.

Specification forming part of Letters Patent No. 188,313, dated March13,1877, application filed October 31,1876.

' State of Ohio, haveinvented certain Improvements in Railroad-OarBrakes, of which the I following is a specification:

The object of my invention is to furnisha device, in combination withthe ordinary brake mechanism, by which to regulate the pressure of thebrake-shoes on the wheels, so that the difference of adhesion of thefront pair of wheels and the rear pair of wheels in the truck to thetrack shall be governed in accordance with the circumstances, asfollows: g

It is found that when the speed of a train is checked the momentum ofthe body of thecar has a tendency to tilt the truck forward, resultingin a greater or increased adhesion of the forward pair of wheels, and alessening of the adhesion of the rear pair of wheels, to the track. Thiscauses the rear wheels to slide on the rails, because the proportion-offorce applied to both the front and rear wheels being equal therevolution of the rear wheels is soonest checked, and the full effect ofthe brakes is thereby not obtained.

To overcome this defect is the object of my invention, which Iaccomplish by the introduction of, and the combination with, the brakemechanism of compensating-levers and connecting-rods, whereby theaforesaid momentum of the train is employed, through the means of thesaid levers, to relieve the pressure on the rear wheels, and increasethe pressure on the forward pair, just in proportion to the power ofthat momentum, and thus effect an equal adhesionv of the wheels to therails. I propose to connect the said levers by connecting-rods to acontinuous draw-bar, or to the body of the car, by either of the plansshown in the drawings.

This improvement consists in the combination, with the ordinary brakemechanism of a car-truck, of the draw-bar E, or its substantialequivalent, connecting-rods F F, and levers G G, in such a manner as toaccomplish the result above stated.

In the accompanying drawing, Figure 1 is a top or plan view of acar-truck having my improvement embodied. Fig. 2 is a verticallongitudinal section of the same. Figs. 3 and 4 are views of modifiedforms of making connection of the compensating-levers with theiroperating power.

A is the frame of the truck; B B are the wheels; (3 O, the brakes, and DD the brakelevers. These are all of the ordinary construction. Myimprovement consists in combining with these a continuous draw-bar, E,connected with the draw-head of the car, pro vided with a frame, E,which surrounds the bolster. Attached to said draw-bar are twoconnecting-rods, F F, which connect it to two levers, G G, having theirfulcrums on the outside of and at ends of the truck-frame, and connectedat their lower ends to the brakebars 0 O. The said draw-bar has twostops, H H, upon it, just inside the supportingblocks, for the purposeof limiting its movement. The operation of this is as follows: When thebrakes are applied to the wheels, and their motion is checked, there isa tendency from the pulling of the car to lift the rear wheels from thetrack; they therefore require less brake-force to check their motion, orelse they would slide on the track first, or before the two forwardwheels. By my arrangement the pull on the draw-bar E acts through therods F F and levers G G to hold 0d the brake from the rear wheels, andcauses a correspondingly-increased force to be exerted upon the forwardwheels. In this manner the force of the brakes is regulated and adjustedto suit the requirementsautomaticall I l! Figs. 3 and 4 are showndifl'erent plans of imparting powerto the aforesaidcompensating-levers,which consist of resting the bolster in a swing, as seen in Fig. 3, oron friction-rolls, as in Fig. 4, fixed in the truckframe, and attachingthe connecting-rods to the transom, and thereby dispensing with thedraw-bar. little oscillating movement, which effects the same result asthe draw-bar.

Having described my invention, I claim- In combination with the brakemechanism of railway-car truck, the levers G G and the connecting-rods FF, when connected by a continuous draw-bar, E, or otherwise, foroperating substantially as and for the purpose set forth.

EDWIN SQUIRE.

Witnesses GEo. W. 'lrBBITTs, F. W. GAJJWELL.

The truck by this method has a

